Inverter output stage

VFD IGBT gate-driver and output-stage path

Connects PWM command, isolated driver supply, gate components, short-circuit protection and the output bridge to overcurrent and repeat-module-failure symptoms.

Functional path

PWM command

Isolation / driver IC

Isolated driver supply

Gate resistor and clamp

IGBT/IPM phase leg

Current sensing

Output terminals

Motor cable

Diagnostic signals and checkpoints

Overcurrent at enableShort-circuit tripOutput phase lossModule fails againNo output after repair

Technician notes

Driver damage can survive after the module is replaced.
Current sensing may create false trips or fail to protect the module.
Motor cable faults must be separated from inverter faults.